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PMID: 8093886 Published · ppublish English Comparative Study Journal Article

Characterization of the tubulin-tyrosine ligase.

The Journal of cell biology ·Vol. 120 ·No. 3 ·1993-02-00 ·Pages 725-32

Ersfeld K, Wehland J, Plessmann U, Dodemont H, Gerke V, Weber K

Abstract

The sequence of tubulin-tyrosine ligase (TTL), the enzyme catalyzing the ATP-dependent posttranslational addition of a tyrosine to the carboxyterminal end of detyrosinated alpha-tubulin, has been determined. TTL from bovine and porcine brain was purified by immunoaffinity chromatography and extensively characterized by protein sequencing. Oligonucleotides derived from the protein sequence were synthesized and partial cDNA sequences were obtained using reversed transcribed brain mRNA in polymerase chain reactions. Polymerase chain reaction fragments were used to isolate a full-length cDNA clone from a randomly primed lambda gt10 cDNA library obtained from embryonic porcine brain mRNA. Porcine TTL is encoded by 1,137 nucleotides corresponding to 379 amino acid residues. It has a molecular weight of 43,425 and a calculated isoelectric point of 6.51. Northern blot analysis revealed a surprisingly long mRNA (approximately 6 kb in embryonic porcine brain). The protein sequence of TTL shares no extended homology with the sequences in the data banks. TTL contains a potential serine phosphorylation site for cAMP-dependent protein kinase (RKAS at positions 73 to 76). Residues 244 to 258 lie at the surface of the molecule. A rabbit antibody raised against a synthetic peptide corresponding to this sequence binds to native TTL. The same sequence contains the cleavage site for endoproteinase Glu-C (residue 248) previously shown to convert TTL into a nicked derivative in which the two fragments still form a tight complex but don't display enzymatic activity.

MeSH Terms
Amino Acid Sequence Animals Base Sequence Blotting, Northern Brain/enzymology Cattle Chromatography, Affinity Cloning, Molecular DNA/genetics Gene Library Molecular Sequence Data Oligodeoxyribonucleotides Peptide Synthases/chemistry,genetics,isolation & purification Poly A/genetics,isolation & purification Polymerase Chain Reaction/methods RNA, Messenger/genetics,isolation & purification,metabolism Sequence Homology, Amino Acid Swine
Chemicals
Oligodeoxyribonucleotides RNA, Messenger Poly A DNA Peptide Synthases tyrosyltubulin ligase
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Ersfeld K
Max-Planck-Institute for Biophysical Chemistry, Department of Biochemistry, Goettingen, Germany.
Wehland J
Plessmann U
Dodemont H
Gerke V
Weber K
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Article Info
Journal
The Journal of cell biology
Abbr.
J Cell Biol
ISSN
0021-9525
DOI
10.1083/jcb.120.3.725
Published
1993-02-00
Pages
725-32
Language
English
Region
United States
NLM ID
0375356
PMCID
PMC2119537
Subset
IM
Databases
GENBANK
X68453
External Links
PubMed source DOI: 10.1083/jcb.120.3.725 PMC Full Text View journal details
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